Giant panda Ya Ya plays at a wildness recovery training base in Foping county in northwest China's Shaanxi province. According to a census by China's State Forestry Administration, the panda population has grown by 268 to a total of 1,864 since the last survey ending in 2003.

Giant pandas, thought to be hermits of the animal kingdom, are actually quite social, according to a study published in the Journal of Mammalogy.

A team of researchers from Michigan State University put GPS collars on five giant pandas from the Wolong Nature Reserve in China. The pandas Pan Pan, Mei Mei, Zhong Zhon, Long Long, and Chuan Chuan were captured, given the collars and released back into the wild where their movements were logged every four hours for two years, from 2010 to 2012.

Pandas were previously thought to be solitary animals, but the GPS trackers found that the three female pandas Pan Pan, Mei Mei, and Long Long spend long periods of time together throughout the year. The male panda Chuan Chuan traveled longer distances but frequently returned the group of female pandas, even outside of the spring mating season.

"Pandas are such an elusive species and it's very hard to observe them in wild, so we haven't had a good picture of where they are from one day to the next," coauthors of the study, Vanessa Hull and Jindong Zhang said in a press release. "This was a great opportunity to get a peek into the pandas' secretive society that has been closed off to us in the past.”

By tracking the pandas’ movements, researchers also found that pandas return to the same locations to feed up to six months after having vacated an area, suggesting that the animals remember particularly good meals and return when the bamboo has grown back.

Very little was previously known about the behavior of pandas, as they are a highly endangered species due to habitat fragmentation, climate change, and human interaction.

The Chinese government does not typically allow researchers to put GPS collars on pandas, since they are under state protection. But Dr. Hull hopes that they will allow future studies to go forward given the success of this most recent one.